Sound Logic Rechargeable Portable Media Speaker with USB (72-4796) Universal 3.5 mm input for compatibility with any iPod / MP3 player Up to 2 hours playback time from a single charge of 2 hours Plug and play MP3s directly from any USB flash drive Supports MP3 playback from SD/MMC media cards Power output: RMS 6W (3W+3W) THD=10% Frequency response: 150-20KHz Sensitivity: 80dB Speaker is powered by included BL-5C rechargeable Li-ion battery with USB charging cable